X-ray powder diffraction data for a new compound (NH4)H2Co2O(OH)(MoO4)1.6(WO4)0.4•H2O type ϕy

Echavarrı́a, Adriana; Amaya, Sandra

doi:10.1017/s0885715618000672

Cited by 5 publications

(4 citation statements)

References 18 publications

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“…In addition, absorption bands at 472 cm –1 for 1 and 497 cm –1 for 2 are both assigned to δ s (I–O) vibrations . In addition, the remaining ν s (M–O) vibrations, which are usually found around 500 cm –1 , possibly overlap with δ s (I–O) vibrations. , Moreover, the broad absorptions around 3436 and 1630 cm –1 may be from water molecules absorbed in air for both compounds. , …”

Section: Resultssupporting

confidence: 72%

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MIO₃F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

et al. 2022

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The iodate anion group has been widely used for design and synthesis of functional materials including nonlinear optical materials but rarely for magnetic materials. Particularly, none of magnetic iodate fluorides has been reported yet. In this work, first, two novel magnetic iodate fluorides MIO3F (M = Co 1 and Ni 2) have been synthesized by a hydrothermal method and characterized by magnetic susceptibility, magnetization, and heat capacity measurements as well as thermogravimetry, Fourier transform infrared spectroscopy (FT-IR), and ultraviolet–visible–near-infrared (UV–vis–NIR) spectroscopy. Compounds 1 and 2 are isostructural and crystallize in the monoclinic space group P21/n with alternating M2+–F2–M2+–O2–M2+ zigzag spin chains along the b axis, which are further separated by triangular IO3 groups in the ab plane. Magnetic susceptibilities suggest that 1 exhibits an antiferromagnetic long-range order (LRO) at 16.5 K, confirmed by heat capacity results with released entropy consistent with the theoretical value for a pseudo-spin of 1/2 for Co2+ at low temperatures. Meanwhile, 2 displays a broad maximum around 10.5 K for low dimensional magnetism followed by a sharp peak at 5.7 K indicating the occurrence of an LRO transition, in good agreement with the heat capacity measurement. Field-dependent magnetizations show an obvious spin-flop transition around 4.5 T and a magnetic hysteresis loop between 4.5 and 7 T for 1, but only a slight slope change could be observed around 2.3 T for 2. Thermal stability, FT-IR, and UV–vis–NIR spectroscopy of 1 and 2 are also reported.

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Section: Resultssupporting

confidence: 72%

“…78,79 Moreover, the broad absorptions around 3436 and 1630 cm −1 may be from water molecules absorbed in air for both compounds. 80,81 UV−Vis−NIR Diffuse Reflectance Spectroscopy. The UV−vis−NIR reflectance spectra (Figure S4) suggest that the optical band gaps of 1 and 2 are 3.3 and 3.7 eV, respectively.…”

Section: Structuralmentioning

confidence: 99%

MIO₃F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

et al. 2022

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“…The infrared spectra in the range of 400–4000 cm –1 for compounds 1 and 2 have been shown in Figure S3 in the Supporting Information. Similar infrared spectra of isostructural compounds 1 and 2 both show a strong characteristic band for MOF 5 (M = Nb 1 , Ta 2 ) octahedron at ν s (M = O) = 913 cm –1 , , and characteristic bands for CoO 2 N 2 F 2 octahedron at ν s (Co–F) = 433 cm –1 , ν s (Co–N) = 470 cm –1 , ν s (Co–O) = 610 cm –1 . − Absorption bands at ∼603 and 570 cm –1 could be assigned to ν(Nb–F) for 1 , and 614 and 552 cm –1 for ν(Ta–F) for 2 . , The broad absorptions at ∼3440 and 1650 cm –1 are assigned to water molecules in 1 and 2 . , The remain vibrations could be attributable to pyrazine (see Figure S4 in the Supporting Information) …”

Section: Resultsmentioning

confidence: 96%

CoMOF₅(pyrazine)(H₂O)₂ (M = Nb, Ta): Two-Layered Cobalt Oxyfluoride Antiferromagnets with Spin Flop Transitions

et al. 2021

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Two cobalt oxyfluoride antiferromagnets CoMOF5(pyz)(H2O)2 (M = Nb 1, Ta 2; pyz = pyrazine) have been synthesized via conventional hydrothermal methods and characterized by thermogravimetric (TGA) analysis, FTIR spectroscopy, electron spin resonance (ESR), magnetic susceptibility, and magnetization measurements at both static low field and pulsed high field. The single-crystal X-ray diffraction indicates both compounds 1 and 2 are isostructural and crystallize in the monoclinic space group C2/m with a two-dimensional Co2+ triangular lattice in the ab plane, separated by the nonmagnetic MOF5 (M = Nb 1, Ta 2) octahedra along the c-axis with large intertriangular-lattice Co···Co distance. Because of low dimensionality together with frustrated triangular lattice, compounds 1 and 2 exhibit no long-range antiferromagnetic order until ∼3.7 K. Moreover, a spin flop transition is observed in the magnetization curves at 2 K for both compounds, which is further confirmed by ESR spectra. In addition, the ESR spectra suggest the presence of a zero-field spin gap in both compounds. The high field magnetization measured at 2 K saturates at ∼7 T with M s = 1.55 μB for 1 and 1.71 μB for 2, respectively, after subtracting the Van Vleck paramagnetic contribution, which is usually observed for Co2+ ions with pseudospin spin of 1/2 at low temperature. Powder-averaged magnetic anisotropy of g = 3.10 for 1 (3.42 for 2) and magnetic superexchange interaction J/k B = −3.2 K for 1 (−3.6 K for 2) are obtained.

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“…97 Moreover, the broad absorption peaks at around 3411 cm −1 and 2922 cm −1 may be from water molecules on the surface of samples absorbed in air. 25,98,99 UV-vis-NIR diffuse reflectance spectra…”

Section: Ft-ir Spectramentioning

confidence: 99%

KMB₄O₆F₃ (M = Co, Fe): two-dimensional magnetic fluorooxoborates with triangular lattices directed by triangular BO₃ units

Wang,

Li,

Dou

et al. 2023

Dalton Trans.

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X-ray powder diffraction data for a new compound (NH₄)H₂Co₂O(OH)(MoO₄)_1.6(WO₄)_0.4•H₂O type ϕ_y

Cited by 5 publications

References 18 publications

MIO₃F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

MIO₃F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

CoMOF₅(pyrazine)(H₂O)₂ (M = Nb, Ta): Two-Layered Cobalt Oxyfluoride Antiferromagnets with Spin Flop Transitions

KMB₄O₆F₃ (M = Co, Fe): two-dimensional magnetic fluorooxoborates with triangular lattices directed by triangular BO₃ units

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X-ray powder diffraction data for a new compound (NH4)H2Co2O(OH)(MoO4)1.6(WO4)0.4•H2O type ϕy

Cited by 5 publications

References 18 publications

MIO3F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

MIO3F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

CoMOF5(pyrazine)(H2O)2 (M = Nb, Ta): Two-Layered Cobalt Oxyfluoride Antiferromagnets with Spin Flop Transitions

KMB4O6F3 (M = Co, Fe): two-dimensional magnetic fluorooxoborates with triangular lattices directed by triangular BO3 units

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X-ray powder diffraction data for a new compound (NH₄)H₂Co₂O(OH)(MoO₄)_1.6(WO₄)_0.4•H₂O type ϕ_y

MIO₃F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

MIO₃F (M = Co and Ni): Magnetic Iodate Fluorides with Zigzag Chains

CoMOF₅(pyrazine)(H₂O)₂ (M = Nb, Ta): Two-Layered Cobalt Oxyfluoride Antiferromagnets with Spin Flop Transitions

KMB₄O₆F₃ (M = Co, Fe): two-dimensional magnetic fluorooxoborates with triangular lattices directed by triangular BO₃ units